Report on TEMPERATURE GRADIENTS IN MOLDED SHAPES OF CORING INFRA-RED TRANSMITTING GLASS

摘要

The temperatures of various cylinders, Fresnel lenses and globes of Coming infra-red transmitting glasses enclosing tungsten lamps of 50 to 1000 watts have been measured at a number of points on the inside and outside surfaces of the glass. Globes of 2566 glass of low thermal expansion coefficient were found to be more resistant to thermal shock than other glasses of similar spectral transmission characteristics, but it cannot be concluded that this glass could be used in exposed positions without being protected from sudden wetting.